It is written clearly in the requirements that all passengers ______ check onto board 30 minutes before the plane takes off.
A．mayB．canC．willD．shall
D
requirements當(dāng)要求講，后面的同位語(yǔ)從句that all passengers ______ check onto board 30 minutes before the plane takes off.應(yīng)該用（should）+do的虛擬語(yǔ)氣，
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